Answer:
the solution is B
Explanation:
BCE counts down to 0 and CE counts up
The last communist leader of the Soviet Union before it collapsed was Mikhail Gorbachev
B if you look back in the history books
Just compare a river map of West Africa to a map of West African kingdoms.
You can clearly see that all of these kingdoms form around the Niger River.
More support to this: None of these other rivers are even in Africa: The Thames is in England, the Indus is in Pakistan, and the Euphrates runs through the Middle East.